Someone explain this bar by pat stay

[RedTank Da Don]

"Welcome to my home...it's pretty empty ain't it?
Freshly painted but she still needs some renovating
But I'm not just about to let you invade and redecorate it
I ain't got it all upstairs, you're welcome to rent the basement"
*crowd goes crazy*

I don't get it why did the crowd react

[ame]http://www.youtube.com/watch?v=YeNvs6p_OKg?t=688[/ame]

"I ain't got it all upstairs, you're welcome to rent the basement"

is there a double entendre I'm missing?

[Dhumble]

[Guest]

[Just Mike]

[dontpraiseme]

[Robin Williams]

[Freddy Burgerz]

[Freddy Burgerz]

[hogwash]

[g00s3y]

[18]

[Roddy]

[18]

[theskeep]

[Purple]